What the GRUB? Installing a new OS when EFI won’t load

The other day, I tried to open the Shudder app on our Fire TV, only to be frustrated when it didn’t load. After searching the internet for any suggestions (as one does), I learned that our Fire TV’s operating system was old. Like, real old. Certain apps, including HBO Max, no longer support older OS versions. We bought the 55-inch television in December 2017, when it was on a mega holiday sale.…